PFAS in Thoste's tap water: under 2.5 ng/L, none of the four main PFAS detected
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
None of the 4 most harmful PFAS detected
The lab sees nothing below 2.5 ng/L, 5 times our benchmark of 0.5 ng/L. Water above our benchmark would pass this check unnoticed.
0.5 ng/L is our benchmark, not an official limit. Same EFSA method as Sweden, Denmark and the Netherlands, but stricter. It's a yearly average, compared here with the latest check.
Sample taken in La Roche-en-Brenil, on the same distribution network as Thoste (SESAM, R. DE CHENESAINT). The health authority samples one tap per network; a network carries the same treated water everywhere.
More about this result
The US also limits PFOA and PFOS to 4 ng/L each, per substance.
The lab detects each of the four substances from 0.5 to 1 ng/L upward. None reached that limit, so their total is below 2.5 ng/L rather than zero.
checked on 25 November 2025
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoropentanoïque (PFPEA) | 0.0089 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.0052 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.0022 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,0005 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,0005 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,0005 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,0005 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,0005 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,002 µg/L |
None found. The lab sees nothing below 2.5 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Thoste
Get new PFAS results for Thoste, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- 16.3 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 25 November 2025
- Water supplier
- SUEZ EAU FRANCE SAS - COTE D'OR
In Thoste, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 25 November 2025. The total is below 2.5 ng/L, the sum of the detection limits and 5 times our 0.5 ng/L benchmark. Sum of 20 PFAS: 16.3 ng/L (0.0163 µg/L), below the EU legal limit (100 ng/L). Sampled in La Roche-en-Brenil, on the same network. 2 checks since 12 February 2025: sum of 20 PFAS from 16.3 ng/L to 17.7 ng/L. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Thoste
2 PFAS checks since 12 February 2025, from the published measurements.
“Calculated”: PFAS-4 worked out from the four substances in the same sample. The chart, averages and trends use lab-published sums only.
| Date | PFAS-4 | Sum of 20 PFAS | Sampled at |
|---|---|---|---|
| < detection limit | 16.3 ng/L | La Roche-en-Brenil | |
| < 2.5 ng/L · calculated | 17.7 ng/L | La Roche-en-Brenil |
Calculated values: “<” is an upper bound from published thresholds, “≥” a lower bound, “–” means no published sum or complete measurement. How to read a PFAS result
What the latest check found
At the latest check, the water was within every limit tested.
See all 8 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Arsenic | 3 µg/L | ≤ 10 µg/L | within the limit |
| Escherichia coli | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Enterococci | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Coliform bacteria | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| pH | 7.8 unité pH | 6.5–9 unité pH | within the limit |
| Electrical conductivity | 222 µS/cm | 200–1,100 µS/cm | within the limit |
| Iron | 23 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,50 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Thoste safe to drink?
Yes. At the check on 25 November 2025, the tap water in Thoste was within every limit tested. “Présence de micro-organismes revivifiables représentatifs de la qualité du traitement. Absence de chlore libre. Des mesures correctives ont été prises pour ajuster la désinfection.”
How high are PFAS levels in Thoste's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 16.3 ng/L. The EU limit is 100 ng/L, so this water is at 16 % of the limit. (below the EU limit)
Does the water in Thoste also meet the strictest limits in Europe?
As far as this check can tell, yes. None of the four compounds was quantified, so their total is below 2.5 ng/L, the sum of the laboratory's detection limits, and under Sweden's legal limit of 4 ng/L in force since 2026.
Are PFAS levels rising in Thoste's tap water?
Calculated PFAS-4 values are listed in the table. The chart uses laboratory-published sum-of-20 results; there are too few laboratory-published PFAS-4 sums for the existing trend calculation.
How hard is the water in Thoste?
No hardness value is available for Thoste in this source.
Where does this data come from?
All values come from official publications: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM). Retrieved on 12 September 2026.
Same water network
Same distribution network as Thoste, so in principle the same water.
Nearby communes
The closest to Thoste on this site.
Data source
- Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM)
- https://hubeau.eaufrance.fr/api/v1/qualite_eau_potable/resultats_dis?code_commune=21635
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 12 September 2026
- Supply networks
- SESAM, R. DE CHENESAINT
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.